Frances Haugen leaked Facebook's research — it showed the company knew its harms

In October 2021, Frances Haugen, a former Facebook product manager, leaked tens of thousands of internal documents to the Wall Street Journal and testified before the US Senate. The documents showed that Facebook's own research had found that Instagram worsened body image issues for teenage girls, that the company's algorithms amplified divisive content, and that Facebook had deprioritized safety features in developing countries.

The most damaging revelation was that Facebook knew about these harms and chose not to act. Internal research showed that 32% of teen girls said Instagram made them feel worse about their bodies, but the company continued to prioritize engagement metrics over user wellbeing.

Haugen's testimony and the 'Facebook Papers' triggered congressional hearings, regulatory scrutiny and a public relations crisis for Facebook (which had recently rebranded as Meta). The case illustrated how a company's internal research can become its most damaging evidence when the findings are suppressed, and how a single whistleblower can shift the entire regulatory landscape.